[TowerTalk] Making a XM-240 into a 340?

[K1TTT]

I modeled that years ago with a 40-2cd and decided it wasn't worth it.  if
you model it be sure to get the loading coil model that includes losses,
they are significant.


David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://www.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
 

> -----Original Message-----
> From: Gene Fuller [mailto:w2lu at rochester.rr.com]
> Sent: Tuesday, November 17, 2009 04:23
> To: Gregg Seidl; TowerTalk at contesting.com
> Subject: Re: [TowerTalk] Making a XM-240 into a 340?
> 
> Hi Gregg-
> I've never tried that but I believe that if it's close enough to act as
> another parasitic element it will have to couple into the driven element
> and
> would most likely lower the feedpoint impedance and you would probably
> want
> to rematch the feedline. It would be a good project to look at with one of
> the computer antenna programs to look at spacing and tunning of both the
> reflector and director and matching for the driven element, but should
> make
> a nice yagi. Good luck with it !
> Gene/W2LU
> 
> 
> ----- Original Message -----
> From: "Gregg Seidl" <k9kl at centurytel.net>
> To: <TowerTalk at contesting.com>
> Sent: Monday, November 16, 2009 5:42 PM
> Subject: [TowerTalk] Making a XM-240 into a 340?
> 
> 
> > Has anyone ever taken an extra Cushcraft 40 meter element and added to
> an
> > existing XM-240 with a longer boom to make a 3 element yagi? Seems it
> > would
> > work to me.
> >
> >  Gregg  K9KL
> >
> >
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